Control means for a sound motion picture camera

ABSTRACT

A MOTION PICTURE CAMERA OR THE LIKE INCORPORATING A SOUND SYSTEM FOR RECORDING OF SOUND ONTO FILM DURING EXPOSURE OF FILM TO SCENE LIGHT INCLUDES A SWITCH WHICH IS CLOSED BY A SENSOR WHEN THE SENSOR DETECTS THE PROPER POSITIONING INTO THE CAMERA OF A FILM CARTRIDGE CONTAINING SOUND FILM. WHEN THE SWITCH IS CLOSED AND THE CAMERA IS ENERGIZED TO INITIATE EXPOSURE OF FILM FRAMES TO SCENE LIGHT, A CIRCUIT IS COMPLETED TO SOUND APPARATUS IN THE CAMERA AND TO A CAPSTAN DRIVE FOR THE SOUND APPARATUS. IN THE ABSENCE OF THE SOUND CARTRIDGE, SUCH AS WHEN A CONVENTIONAL, NON-SOUND OR SILENT CARTRIDGE IS POSITIONED IN THE CAMERA, THE SWITCH REMAINS OPEN, THEREBY DE-ENERGIZING THE SOUND APPARATUS AND CAPSTAN MOTOR TO AVOID DRAIN ON THE RELATED BATTERY OR POWER SUPPLY. THE SWITCH CAN BE IN A CIRCUIT INCLUDING A BATTERY, A SECOND SWITCH THAT IS CLOSED WHEN THE CAMERA IS ENERGIZED BY THE OPERATOR ENGAGING A TRIGGER MECHANISM, AND AN AMPLIFIER CIRCUIT COMPRISING PART OF THE SOUND APPARATUS. THE CAMERA DISCLOSED HAS A MOTOR FOR THE FILM PULL-DOWN MECHANISM AND A SEPARATE CAPSTAN MOTOR FOR THE SOUND APPARATUS. THE SENSOR ALSO CLOSES A THIRD SWITCH TO THE CAPSTAN MOTOR WHEN A SOUND CARTRIDGE IS IN THE CAMERA, AND OPENS THE THIRD SWITCH AT OTHER TIMES. ALSO DISCLOSED IS A CIRCUIT FOR CONTROLLING THE SPEED OF THE MOTOR FOR THE PULL-DOWN MECHANISM AS A FUNCTION OF THE SIZE OF THE LOOP BETWEEN THAT MECHANISM AND THE SOUND CAPSTAN.

EEENSWE PULICATIUN UNITED STATES PATENT OFFICE Published at the requestof the applicant or owner in accordance with the Notice of Dec. 16,1969, 869 O.G. 687. The abstracts of Defensive Publication applicationsare identified by distinctly numbered series and are arrangedchronologically. The bending of each abstract indicates the number ofpages of specification, including claims and sheets of drawingscontained in the application as originally filed. The files of theseapplications are available to the public for inspection and reproductionmay be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Ofilce makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED MARCH 5, 1974 T920,009 CONTROL MEANS FOR A SOUND MOTIONPICTURE CAMERA Gerald J. Kosarko, Pavilion, N. (901 Elmgrove Road,Rochester, N. 14650) Filed Apr. 30, 1972, Ser. No. 356,005 Int. Cl.G03!) 23/02 US. Cl. 35272 2 Sheets Drawing. 12 Pages Specification Amotion picture camera or the like incorporating a sound system forrecording of sound onto film during exposure of film to scene lightincludes a switch which is closed by a sensor when the sensor detectsthe proper positioning into the camera of a film cartridge containingsound film. When the switch is closed and the camera is energized toinitiate exposure of film frames to scene light, a circuit is completedto sound apparatus in the camera and to a capstan drive for the soundapparatus. In the absence of the sound cartridge, such as when aconventional, non-sound or silent cartridge is positioned in the camera,the switch remains open, thereby de-energizing the sound apparatus andcapstan motor to avoid drain on the related battery or power supply. Theswitch can be in a circuit including a battery, 9. second switch that isclosed when the camera is energized by the operator engaging a triggermechanism, and an amplifier circuit comprising part of the soundapparatus. The camera disclosed has a motor for the film pull-downmechanism and a separate capstan motor for the sound apparatus. Thesensor also closes a third switch to the capstan motor when a soundcartridge is in the camera, and opens the third switch at other times.Also disclosed is a circuit for controlling the speed of the motor forthe pull-down mechanism as a. function of the size of the loop betweenthat mechanism and the sound capstan.

Marc 5, 1974 G. J. KOSARKO N Hm'mm CAMERA CONTROL MEANS FOR A SOUNDMO'ITO 2 Sheets-Sheet 1 Filed April 30, 1973 FIG. 2

Mai-ch 5, 1974 G. J. KQSARKQ CONTROL MEANS FOR A SOUND MOTION PTCTURECAMERA Filed April 50, 1975 2 Sheets-Sheet 2 MOTOR CONTROL CIRCUIT

